论文标题
Na3Co2SBO6中的巨型磁性内部各向异性和竞争不稳定性
Giant magnetic in-plane anisotropy and competing instabilities in Na3Co2SbO6
论文作者
论文摘要
我们报告了在Na3Co2SBO6的无双单晶体上获得的磁力测定数据，该数据被认为是实现Kitaev Honeycomb模型用于量子自旋液体的候选材料。与普遍的信念相反，这种材料可以用理想蜂窝晶格的对称性建模，我们的数据表明，尽管蜂窝层的微小的正交异常失真低于0.2％，但显着的两倍对称性对称性和平面各向异性超过200％。我们进一步使用磁性中子衍射来阐明磁力测定法中观察到的各种场诱导的相。这些阶段在顺磁性状态中表现为与竞争铁磁和抗铁磁磁性不稳定性相关的弥漫性散射信号，这与也预测附近的量子旋转液相的理论一致。我们的结果要求对观察到的面内各向异性的理论理解，并使Na3Co2SBO6成为通过靶向外部调整找到外来量子相的有前途的理由。
We report magnetometry data obtained on twin-free single crystals of Na3Co2SbO6, which is considered a candidate material for realizing the Kitaev honeycomb model for quantum spin liquids. Contrary to a common belief that such materials can be modeled with the symmetries of an ideal honeycomb lattice, our data reveal a pronounced two-fold symmetry and in-plane anisotropy of over 200%, despite the honeycomb layer's tiny orthorhombic distortion of less than 0.2%. We further use magnetic neutron diffraction to elucidate a rich variety of field-induced phases observed in the magnetometry. These phases manifest themselves in the paramagnetic state as diffuse scattering signals associated with competing ferro- and antiferromagnetic instabilities, consistent with a theory that also predicts a quantum spin liquid phase nearby. Our results call for theoretical understanding of the observed in-plane anisotropy, and render Na3Co2SbO6 a promising ground for finding exotic quantum phases by targeted external tuning.
